diff --git a/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QA.java b/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QA.java
index e9b0566..b3fc4e8 100644
--- a/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QA.java
+++ b/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QA.java
@@ -1,5 +1,8 @@
 package io.github.timemachinelab.core.qatree;
 
+import lombok.Data;
+
+@Data
 public abstract class QA {
 
     protected final QAType type;
@@ -10,5 +13,14 @@ public abstract class QA {
 
     public QA(QAType type) {
         this.type = type;
+        this.createTime = System.currentTimeMillis();
+        this.updateTime = this.createTime;
+    }
+
+    /**
+     * 更新updateTime为当前时间戳
+     */
+    public void updateTimestamp() {
+        this.updateTime = System.currentTimeMillis();
     }
 }
diff --git a/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QaTreeDomain.java b/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QaTreeDomain.java
index 6717c5c..2425b3f 100644
--- a/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QaTreeDomain.java
+++ b/prompto-lab-app/src/main/java/io/github/timemachinelab/core/qatree/QaTreeDomain.java
@@ -13,8 +13,8 @@ public QaTree createTree(String userStartQuestion) {
         return new QaTree(startNode);
     }
 
-    public QaTree appendNode(QaTree tree, String parentId, QaTreeNode node) {
-        tree.addNode(parentId, node);
+    public QaTree appendNode(QaTree tree, String parentId, QA qa) {
+        tree.addNode(parentId, new QaTreeNode(qa));
         return tree;
     }
 }